Be successful with computers and such? Don’t be daft! (4,3,2)
I believe the answer is:
come off it
'such? don't be daft' is the definition.
I can't tell whether this definition defines the answer.
'be successful with computers' is the wordplay.
'be successful' becomes 'come off' (if something comes off, it works as planned).
'with' means one lot of letters go next to another.
'computers' becomes 'IT' (information technology).
'comeoff'+'it'='COME OFF IT!'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for come off it that I've seen before include "that's most unlikely" , "stop behaving like that!" , "Stop messing about!" , "People climbing dangerous structure may be told to" , "Don't be ridiculous!" .)